1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 299Get this manual
Armature Tests TEST FOR SHORTS Check armature on Growler per the Growler manufacturer's instructionsReplace armature if short is indicatedTEST FOR GROUND 1Use an Ohmmeter (R scale)Connect one lead on armature shaft and other lead on commutatorIf continuity is indicated, armature is groundedReplace armature
FIELD TESTS IMPORTANT: Commutator end of armature must be installed in brushes when performing the following testsOhmmeter Leads Between Green and Blue Motor Wires Green and Black Motor Wires Blue and Black Motor Wires Black Motor Wire, and Frame (Motor Housing) Green Motor Wire, and Frame Blue Motor Wire, and Frame Resistance (Ohms) No Continuity No Continuity No Continuity Scale Reading (xFull Continuity (R 1) Full Continuity (R 1) Full Continuity (R 1) Full Continuity (R 1) Full Continuity (R 1) Full Continuity (R 1)